The main focus of this proposal is to determine the in vivo requirements for CD8 T cell activation and migration to the intestinal mucosa. Our preliminary results indicate interesting migratory patterns following activation of TCR transgenic CD8 T cells by the soluble antigen, ovalbumin. In particular, an accumulation of activated CD8 T cells with unique phenotypes occurs in the mesenteric lymph nodes and in the lamina propria and intestinal epithelium. Our system allows for the first time an anlysis of naive intestinal T cells and visualization of a primary immune response in the intestinal mucosa. In addition we have employed an adoptive transfer system in which small numbers of TCR transgenic T cells are transferred to normal hosts. Following immunization we are then able to observe migration to mucosal tissues and modulation of adhesion/homing receptors. Our preliminary data indicates that ICAM-1 and CD18 integrins are important players in the process of intestinal T cell activation and homing. The experiments described will focus on further definition of the model system, defining the adhesion/activation molecules involved in CD8 T cell activation and migration, and producing model systems to study antigen presentation and recognition in intestinal epithelial cells.
The aims of the proposal are:
Aim 1 : To define the parameters for activation of CD8+ T cells in an in vivo model.
Aim 2 : To determine the molecular interactions necessary for CD8+ T cell activation and trafficking to the intestine in vivo.
Aim 3 : To determine the role of antigen expressed by intestinal epithelium in T cell activation and tolerance induction. Overall, the experiments proposed will provide a comprehensive analysis of the consequences of CD8 T cell activation on the intestinal immune system.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI041576-04
Application #
6170481
Study Section
Immunological Sciences Study Section (IMS)
Program Officer
Ash-Shaheed, Belinda
Project Start
1997-08-01
Project End
2002-07-31
Budget Start
2000-08-01
Budget End
2001-07-31
Support Year
4
Fiscal Year
2000
Total Cost
$212,302
Indirect Cost
Name
University of Connecticut
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
City
Farmington
State
CT
Country
United States
Zip Code
06030
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Jellison, Evan R; Turner, Michael J; Blair, David A et al. (2012) Distinct mechanisms mediate naive and memory CD8 T-cell tolerance. Proc Natl Acad Sci U S A 109:21438-43
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